% 文档类
\documentclass{ctexart}
% 导言区

% 正文区
\begin{document}
	
 \begin{center}	
	Centered text using a	
	\verb|center| environment.	
\end{center}

\begin{flushleft}	
	Left-aligned text using a	
	\verb|flushleft| environment.	
\end{flushleft}

\begin{flushright}	
	Right-aligned text using a	
	\verb|flushright| environment.	
\end{flushright}
	
\end{document}